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Equivalent Wattage - While lumens are the new standard, it helps to have an easily recognizable guide. Comparing an LED bulb to an incandescent will give you a rough estimate of just how well it will light a room. As a very ballpark figure for LED wattages, 1/4 or 1/5 the incandescent wattage value is usually close to what you need. Lumens - Lumens directly measure just how much light the bulb gives out in total. On average, a 60-watt incandescent shines at 800 lumens, with roughly 50-100 lumens of difference above or below. The variance depends on manufacturer and age of the lamp. LEDs are directly rated for their max lumen rating and last much longer without dimming of the bulb. Color Temperature - Your guide to how the light itself will look. Lower values are warmer, with 2700-3000K being a more incandescent "warm white" while higher temperatures like 5000K will deliver a very harsh "stark white" light. Our Lighting Guide lets you select a color temperature and see how it transforms a kitchen. Driver Content - Because of their design, LEDs do not typically run on AC voltage. Many LEDs require some form of driver to convert the voltage from AC to DC for proper operation. The majority of socket-based LED lamps are self-driven, but you should always check before buying to make sure that you buy both an LED and a driver at the same time if it isn't self-driven.

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LED replacement bulbs are durable and ecologically friendly. Did you know you can recycle LED bulbs and reduce your carbon footprint up to one third? LEDs outlast the competition, staying bright for up to 11 years of continuous operation. This means less time climbing ladders trying to replace those hard to reach bulbs in vaulted ceilings.

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The electric field of light follows an elliptical propagation. The amplitude and phase difference between the two linear components are not equal.

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Light is the interaction of electric and magnetic fields travelling through space. The electric and magnetic vibrations of a light wave occur perpendicularly to each other. The electric field moves in one direction and the magnetic field in another ‘perpendicular to each other. So, we have one plane occupied by an electric field, another plane of the magnetic field perpendicular to it, and the direction of travel is perpendicular to both. These electric and magnetic vibrations can occur in numerous planes. A light wave that is vibrating in more than one plane is known as unpolarized light. The light emitted by the sun, by a lamp or a tube light are all unpolarised light sources. As you can see in the image below, the direction of propagation is constant, but the planes on which the amplitude occurs are changing.

Polarization, in Physics, is defined as a phenomenon caused due to the wave nature of electromagnetic radiation. Sunlight travels through the vacuum to reach the Earth, which is an example of an electromagnetic wave. These waves are called electromagnetic waves because they form when an electric field interacts with a magnetic field. In this article, you will learn about two types of waves, transverse waves and longitudinal waves. You will also learn about polarization and plane polarised light.

There are two linear components in the electric field of light that are perpendicular to each other such that their amplitudes are equal, but the phase difference is π/2. The propagation of the occurring electric field will be in a circular motion.

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LED light bulbs can save you money not only because they are roughly 80 percent more energy efficient than other bulbs, they also produce far less heat than metal halides, CFLs, and incandescent light bulbs. Upgrading to LED lighting means you won't spend your summer months cooling down rooms that your light bulbs are busy heating up. While originally a cooler blue tone than incandescent bulbs, LEDs now come in daylight and warm white color temperatures so you can more easily replace your existing bulbs without altering the color of your room. Visit our Lighting Guide to see what difference color temperature makes. LED lighting also offers a superior color rendering index (CRI), so you can see the colors of your artwork or makeup more accurately.

Transverse waves are waves, in which the movement of the particles in the wave is perpendicular to the direction of motion of the wave.

The other kind of wave is a polarized wave. Polarized waves are light waves in which the vibrations occur in a single plane. Plane polarized light consists of waves in which the direction of vibration is the same for all waves. In the image above, you can see that a plane polarized light vibrates on only one plane. The process of transforming unpolarized light into polarized light is known as polarization. The devices like the polarizers you see are used for the polarization of light.

LED light bulbs for the win! When it comes to purchasing energy-efficient lighting, LEDs surpass CFLs by a wide margin. LEDs are instant-start with no warmup time needed. They work well in cold weather, and are substantially more durable since manufactured out of plastic instead of glass. From standard bulbs to fluorescent tubes, LEDs can replicate the same lighting conditions found in fluorescents while lasting longer and using less energy. As an added bonus, all LEDs are RoHS compliant and do not use mercury, a claim that can't be made by fluorescent bulbs.